This week I was looking into Electric circuits and connecting electronics to circuts. The into was to do a Temperature sensor circuit.
This general purpose temperature sensing circuit uses a thermistor to detect changes in temperature. It is designed for use with a 3V – 9V battery. When the components are connected, the LED will light up when the temperature rises above a set level. The sensitivity of the circuit can be set by adjusting the potentiometer. In cool conditions the thermistor has a nigh resistance and so the transistor is switched off. The LED is therefore off. In warm conditions the thermistor has a low resistance and so the transistor is switched on. The LED therefore lights up.
I drew out the circuit I was using with labels to each one of these componenets:
PCB, BC548 transistor, Thermistor, 1K resistor, 3K3 resistor, Standard LED, 10K potentiometer, battery connector.
Image of circuit
With the materials and layout I got to soldiering. Soldering I had done a bit before, but found a few new hacks along the way. Something new I learnt was to feed thew wire through the boards and shoulder from the back where it comes out, its faster and just as secure. Other things I learn was not to create a bubble around as its not as secure, Make that volcano shape instead
After I got it all soldered in it worked, as expected. it was useful looking and playing around with the board and getting familiar with the resistors, LEDs and transistors.
We then went through this machine. This is the power supply which you can control the current (electrical bandwidth) and the amps (how much fills the bandwidth) this is to replace you using batteries and have digital measurements on everything. 
After soldering the circuits together We then went through adding electronics to a circuit. I was using The BBC Microbit. The micro bit easily allows you to add commands to a circuit, through would normally be coding, but the micro bit has its own coding technique. This is the micro bit:
The micro bit has many inputs and outputs. It includes Buttons A and B with inputs. there are light and touch sensors, power inputs and reset buttons. at the bottoms has numbers 0 to 3 and ground. These we would use to add outer components.
To start adding other components more easily I used an edge connector breakout. this would slot over the bottom part of the micro bit over the 0 to ground parts. There are 20 spikes that we could then add components.
To then mske it easier visually for me i connected that to a solder less breadboard.
On this circuit, I used an LED and some wires and resistor wunning through the breadboard into the edge connector breakout into microbit. this wasn’t as necessary but made it easier visually to put everything together. The Micro bit coder that i was going to use looked like this.
This has a very simple layout that made it a lot easier to code there was specific inputs, outputs and functions you can run through this programme. The code i put together for this is to flash the light when button A is pressed.
I had previously used a similar program scratch a while ago, and this had the exactly the same feel as that, but were programming it onto an actual board. And this was my outcome:
I then also went onto explore with just the bread board understanding the flow of current through it.
